DE19610671A1 - Process to suspend weft thread bundles in hooks of transport chains - Google Patents

Abstract

A process to suspend weft thread bundles in the hooks of transport chains of a knitting or stitch-bonding machine comprises continuously laying a thread bundle in opposite alternating directions by a cart and a laying stroke (53) transverse relative to the working point over transport chains a distance apart from each other. The bundle is moved to the next laying stroke start-point with the aid of weft thread guides on the cart which can move at any one time transversely relative to the laying direction, outside the hooks' motion path and by a racking stroke (54, 54') relative to the chains' motion. The weft thread guides are brought up to the chain speed at the end of a laying stroke, racking stroke or both and, at any one time, before crossing the path of the chain hooks and parallel to and aligned in the same direction as chain motion. A supplementary racking stroke (55, 55') is superimposed on the weft thread guide during the laying stroke between the two chains, this stroke having, in the direction of the chains' motion, a velocity component on average greater than that of the chains. The sum of all the racking and supplementary racking strokes is zero within one cycle.

Description

The invention relates to a method for one hang from wefts in the hooks of the trans port chains of a warp knitting or sewing machine, whereby a weft thread group by means of weft trolley, with Laying stroke across two spaced apart Transport chains moved to the point of action in mutually changing directions is laid and the weft threads with the help of, on the weft trolley Weft thread guides that can be moved transversely to the laying direction outside the path of movement of the hooks relative for moving the transport chains with offset stroke next starting position for the laying stroke is movable.

Devices for laying weft threads in droves on warp knitting machines, in particular sewing knitting machines, are known in different variants.

With the German patent specification 20 13 694 a Sewing machine described. This sewing machine has the font on both sides at right angles to it arranged endless transport chains, the upper strand of which continuously moved against the stitch formation point.

These transport chains have each other in pairs open hooks pointing upwards.

A shot wagon becomes iridescent over the two Transport chains moved away. His weft guide has tubular weft eyelets between  the hooks of the transport chain can intervene. Of the The weft guide is parallel to the weft trolley Transport direction of the chains can be shifted.

This weft guide is driven between the transport chains with the help of fixed tax curves.

The weft guides have the plane of movement of the hooks of the transport chains exceeded, leaves one pre-tensioned compression spring the weft guide outside snap back the row of hooks so that the weft who are assigned to a neighboring hook group the.

This control curve for the weft guide is like this designed that the weft guide during the laying stroke is displaced in the direction of movement of the chains.

If it has reached the necessary position, it will lower right to the direction of movement of the transport chains the row of hooks moved and behind the row of hooks into the brought new position. In the new position is the Weft leader at his stop on the laying carriage. This also becomes perpendicular to the trajectories of the transport chains.

Such a device has only one theory value. The distances between the hooks must be like this be chosen large that the weft guide, esp especially their individual tubes, free in any case can be moved through the hook alleys.

The textile surfaces made with it show structure doors that are not useful for the clothing sector are.

One has tried other means of offsetting the shot coulter behind the hooks of the transport chains use.  

With DE-OS 20 12 114 a device was wrote in which the weft guide on the weft gen is rigidly attached. An additional, comb-like eng thread guide is outside the movement tracks of the transport chains.

This comb is with its teeth against the row of hooks directed. The wefts are between simultaneously Hook and teeth of this comb are placed.

Immediately after the weft guide has passed these combs are against the direction of movement Transport chains offset. On the return stroke of the weft the weft threads of the assigned to the next hook group.

The disadvantage of this arrangement is that the Vorrich tion because of the large number of weft threads and the large Number of due to different drive elements Moving parts complicate and disrupt the device becomes vulnerable. The cost of making the Devices are high, maintenance is time consuming.

The variability of the laying of the weft threads is extreme limited because different work for each laying elements are necessary.

Also with regard to the density of the weft threads there are significant restrictions because here too Weft threads on a path perpendicular to the path of the Trans port chains are routed across the same. The Machine must be oversized in depth. she takes up a lot of space.

Aiming to increase the number of elements of the device reduce and the possibilities of laying variants to increase, was with the DE patent 39 32 184 C1 Device proposed in which the laying stroke of the  Shot-laying car by a computer-controlled motor is generated via a spindle.

For the offset movement of the weft guide on the weft laying car is a second on the weft laying car itself computer controlled motor provided the movement the weft guide can control across the laying stroke. Process steps for the treatment of the thread are not described.

The main patent 196 04 422.7 proposed instead of the second motor on the shot wagon for the offset of the weft guide a drive see who is stationary.

The movement of this fixed drive is on Transfer the moving part on the slide. With the diffe boundary movement between the shot wagon and the movement movement of the moving part, the weft thread guide becomes Direction of offset moved.

The main patent contains different forms of absolute trajectory of the weft guide indicated tet.

It is proposed for the first time, the weft guide during the passage through the row of hooks of the Trans port chains in the transport direction with the same Ge speed with which it moves the transport chain ten do.

To ensure that both the alignment of the Movement sections of the web on the transport chain and also the offset movement outside the transport chains be carried out in the time available you have the offset movement outside of the Chains aligned in the same direction as the transport chains tet.  

Apart from the fact that there is one outside the chains guarantee very high offset speed is the thread that can be laid with it cannot be used for many applications.

The thread sheets were laid in an irregular manner Wise one above the other. The density of the weft knitted fabric dropped many wishes open.

Especially when processing weft threads Glass or carbon came to loosen such Threads. The threads came loose from the Hooks of the transport chains. The goods then manufactured was flawed.

The object of the present invention is regardless of the specified repeat, the weft den, even when using silk made of glass or Koh lenstoffe, reliably arranged as closely as possible Insert the hooks of the transport chains, the same outside the row of hooks while avoiding Schlin and the new group of hooks to pass without any problems.

The variability in the way of shooting should at least be preserved without the ver carelessness of the insertion of the weft threads impaired becomes.

According to the invention, this object is achieved by the in Proof 1 defined procedure to relatively simple che way solved.

By adjusting the motion component of the weft guide to the respective speed of the trans port chains in the phase of crossing the row of hooks through the weft guides, both at the transition from  Laying stroke to the offset stroke as well as in the transition from Offset on the laying stroke, high security of the Insertion process guaranteed.

If you ensure that the absolute speed of the Weft thread guide especially in the transition from ver Block stroke to the next laying stroke always slightly larger is than the speed of the transportation chain, then glass and carbon fibers can also be reliably embarrassed.

If one uses the direction of offset according to claim 2, has one on the one hand, with regard to the thread position speaking form of laying and also comes with relatively low displacement speeds of the weft the leader.

With the design of the method according to claim 3 possibilities are shown how to weft la in a larger repeat of laying strokes on very can design and control different ways.

The process design described in claim 4 defines certain criteria of the procedure for a variable design of the legends, in which the ver Block stroke in the direction of movement of the transport chains if executed.

The method of claim 5 ensures that the Program combined strokes in any case a bumpless and if possible also jerk-free Movement of the weft guide in every movement phase allow.

The elements and methods defined in claim 6 steps also allow the use of additional ones  Guide means between the two outer transport chains. The weft threads can also guide in this elements are inserted with high precision.

The invention is described below in one embodiment game are explained in more detail. The associated drawing shows:

Fig. 1 is an overall schematic representation of the on drive for the weft laying carriage and the weft thread guide on the laying carriage,

Fig. 2 is a schematic overall view of the absolute movement path of a weft thread guide over both transport chains,

Fig. 3 is a representation analogous to FIG. 2, with the inclusion of a Verlagerungshubes,

Fig. 4 is a view analogous to FIG. 2 with programs for a simple zigzag interpretation,

Fig. 5 shows the absolute trajectory of a weft yarn guide with a repeat over several double laying strokes and

Fig. 6 is a representation analogous to Fig. 5, including offset strokes that are carried out in the transport direction of the chain.

The warp knitting machine has for the placement of weft thread coulters one over the transport chains 3, 4 movable bar weft 1 .

The weft laying carriage 1 is guided on guide rails 11 and moved by means of toothed belts 13 via the coupling 12 with a laying stroke via both transport chains 3, 4 .

For the drive, a motor 16 is provided which can be computer-controlled, position-oriented, and can generate a drive movement according to precisely specified movement laws. This drive movement is carried over the drive wheel 15 and the toothed belt 13 to the weft laying carriage 1 .

On the weft laying carriage 1 is transversely of the weft yarn guide 2 towards the drive movable in a guide 21st This also receives its drive from a motor 27 , which is computer-controlled, position-oriented, and can generate a drive movement according to precisely prescribed laws of motion.

This movement he transmits according to the teaching of the main patent on a toothed belt 24 , which is guided via fixed rollers 25, 26 .

The drive movement of the toothed belt 24 is taken over by the drive wheel 231 on the weft laying carriage 1 . The support roller 233 ensures the reliable engagement of the toothed belt 24 .

Another toothed belt 23 , which is guided on the weft-laying carriage 1 via the rollers 231 and 232 , moves the weft thread guide 2 via the coupling 22 .

The weft thread guide 2 is equipped with tubes or laying needles for each weft thread, which protrude from the bottom of the thread guide and can pass through the gaps between the hooks 31 , 41 of the transport chains 3 , 4 during their laying movement.

This version is of course only intended as an embodiment. It is crucial that this weft guide 2 can position the weft on the transport chain 3 , 4 at a precisely specified point.

The manner in which the weft threads are placed is to be described on the absolute path of movement 5 ( FIG. 2) of a single weft thread guide.

We start looking at motion section 51 . The weft guide moves over the hook 31 of the transport chain 3 at a certain speed.

The component 281 of this speed directed in the direction of movement 32 of the transport chains 31 corresponds to the speed 33 of the transport chain.

Immediately thereafter, this component is decelerated to zero and accelerated in the offset direction 54 against the trans port direction 32 .

Has the weft guide 2 almost reached its intended starting position for the next laying stroke 53 , it is delayed and accelerated again in the direction of the transport.

He can step through the hook 31 at 51 'again at synchronous speed.

At the next laying stroke in the direction of the other trans port chain 4 , the weft guide also performs an additional offset stroke 55 , which corresponds to the size of the displacement stroke 54 here. He is opposed to this hub.

The component 282 of the speed, which is directed in the transport direction, is greater than the transport speed 33 , 43 of the transport chain 3 , 4 .

Shortly before the hook row 41 of the transport chain 4 , this component of this speed is reduced again to the speed 43 of the transport chain 4 . Thus, the weft guide 2 crosses the row of hooks 41 .

Then the weft guide is again moved against the transport direction 42 with the offset stroke 54 '.

The process corresponds to that which has been described in relation to the crossing of the transport chain 3 .

In position 52 ', the weft guide again has a speed in the transport direction, which corresponds to the speed 43 of the transport chain.

In each insertion and offset phase, it is important that the piece of weft thread, which is between the opening of the weft thread guide and the hook 31 , 41 , which carries the weft thread last, is always taut. This is reliably achieved if the absolute speed of the weft guide 2 is always greater than the increase in length of the free piece of thread per unit of time.

It has proven to be expedient to specify the individual movement phases as combinable control programs for the computer for controlling the motors 15 , 27 . Each of these programs should control laws of motion that are at least bump-free and jerk-free if possible. The transitions should be designed so that the trajectories merge tangentially.

The use of simple sinoids and sinoids after Besterhorn has proven itself.

The basic form of the movement shown in FIG. 2 can be modified in many different ways.

In Fig. 3 this basic movement 6, a displacement movement 56 is considered. The weft layer is thus inclined to the direction of transport and the wefts are aligned parallel to each other. The offset hub 64 , 64 'corresponds approximately to the width of the weft sharp. The additional offset stroke 55 also corresponds to the size of the offset stroke 64 , but with a different sign.

The transitions 71 , 71 '; 72 , 72 'on the rows of hooks 31 and 41 are designed as they were described with reference to FIG. 2.

Fig. 4 shows a movement path 7 of a weft guide 2 for the layers of zigzag layers. The Ver record stroke 74 , 74 'is reduced to the smallest size.

In FIGS. 5 and 6 are recordable by way of combinations of countershaft strokes with different offset and additive shown stroke amounts.

In Fig. 5 all offset movements are shown - with different offset sizes 84 , 84 ', 84 '', 84 ''' but with the same direction of offset. The sum of all offset strokes 84 , 84 ', 84 '', 84 ''' in a repeat is equal to the sum of the additional offset strokes ( 55 ) with a different sign. The crossing points 81 , 81 ', 81 '', 81 ''', 82 , 82 ', 82 '', 82 ''' on the transport chain 3 , 4 also correspond to the basic rules described here. ( Fig. 2).

In Fig. 6 misalignment movements with different displacement sizes 94 , 94 ', 94 '', 94 ''' and with different displacement directions are shown. The sum of all offset strokes 94 , 94 ', 94 '', 94 ''' and the additional offset strokes ( 55 ) in one repeat is equal to zero here.

The crossing points 91 , 91 ', 91 '', 91 '''; 92 , 92 ', 92 '', 92 ''' via the transport chain 3 , 4 also correspond to the basic rules described here. ( Fig. 2).

When designing such reports, it is important that the weft thread guide again after each repeat freely chosen starting point reached.

The design of the reports itself is based on the desired textile technological effects.

Reference list

1 shot car
11 guide rails
12 clutch
13 timing belts
14 guide wheel
15 drive wheel
16 engine
2 weft guides
21 leadership
22 clutch
23 timing belts
231 drive wheel
232 Leadership role
233 support roller
24 timing belts
25 leadership role
26 drive wheel
27 engine
3 transport chain
31 hook level
32 Transport direction
33 Transport speed
4 transport chain
41 hook level
42 Direction of transport
43 Transport speed
5 movement path weft guide
51 , 51 ′ ,
52 , 52 ' sections of the path of movement in the crossing area of the hook plane
53 laying stroke
54 , 54 ′ offset stroke
55 , 55 ′ additional offset stroke
56 displacement stroke
6 movement path weft guide
61 , 61 ′ ,
62 , 62 ' sections of the path of movement in the crossing area of the hook plane
64 , 64 ′ offset stroke
7 Movement path weft guide
71 , 71 ′ ,
72 , 72 ' sections of the path of movement in the crossing area of the hook plane
74 , 74 ′ offset stroke
8 movement path weft guide
81 , 81 ′ , 81 ′ ′ , 81 ′ ′ ′
82 , 82 ' , 82'' , 82''' sections of the trajectory in the crossing area of the hook plane
84 , 84 ′ , 84 ′ ′ , 84 ′ ′ ′ offset stroke
9 Movement path weft guide
91 , 91 ′ , 91 ′ ′ , 91 ′ ′ ′
92 , 92 ' , 92'' , 92''' sections of the trajectory in the crossing area of the hook plane
94 , 94 ′ , 94 ′ ′ , 94 ′ ′ ′ offset stroke
Ü overstroke

Claims (7)

1. Method for hanging weft coulters in the hooks of the transport chains of a warp knitting or sewing machine, wherein
a weft thread set is placed in mutually alternating directions by means of a weft trolley by means of a laying stroke across two transport chains which are continuously moved at a distance from one another and,
the weft thread sheet can be moved outside of the path of movement of the hooks by means of weft thread guides which can be moved transversely to the laying direction on the weft trolley relative to the movement of the transport chains by means of an offset stroke to the next starting position for the laying stroke,
characterized in that the weft guides

• - at the end of a laying stroke and / or
• - at the end of an offset stroke,
• - before crossing the path of movement, the hooks of a transport chain,
• - parallel and aligned with the direction of movement of the transport chain

brought up to the speed of the transport chain and
that the weft leader

• - Chain between the two transport chains during the laying stroke
• - An additional offset stroke is superimposed
  • - which has a speed component in the direction of movement of the transport chains that is higher on average than the speed of the transport chains,
  • - The sum of all offset strokes and additional displacement strokes in a repeat is zero.

2. The method according to claim 1, characterized in that that the offset stroke is always against the direction of movement of the transport chains. 3. The method according to claim 1 and 2, characterized in that the additional offset stroke a displacement stroke

• - is superimposed against and / or in the direction of movement of the transport chains,
• - whereby the sum of all displacement strokes in a repeat is zero.

4. The method according to claim 1, characterized in
that the offset stroke is always directed in the direction of movement of the transport chains and
that a displacement stroke is superimposed on the additional offset stroke counter to the direction of movement of the transport chains,

• - The sum of all displacement strokes, all offset strokes and all additional offset strokes in one repeat is zero.

5. The method according to any one of claims 1 to 4, characterized featured, that each stroke, the laying stroke, the offset stroke, the Additional offset stroke and the displacement stroke individually, bumpless motion laws are assigned. 6. The method according to any one of claims 1 to 4, characterized characterized in that between the transport chains Wefts an additional, driven guide get and the offset movement of the weft guide in the area of these guides the transport speed speed of these guides is adjusted.